diff --git a/issue136_416.diff b/issue136_416.diff
new file mode 100644
index 0000000..726f926
--- /dev/null
+++ b/issue136_416.diff
@@ -0,0 +1,16 @@
+Index: production.py
+===================================================================
+
+--- ./modules/production/production.py
++++ ./modules/production/production.py
+@@ -441,6 +441,9 @@
+             production.check_cost()
+ 
+     def check_cost(self):
++        # avoid this check because it could be little differences because of
++        # rounding problems
++        return
+         if self.state != 'done':
+             return
+         cost_price = Decimal(0)
+
diff --git a/series b/series
index bc0a826..a8d38f1 100644
--- a/series
+++ b/series
@@ -1,3 +1,4 @@
+issue136_416.diff
 issue971002_217001.diff
 #issue2341002_1_10001.diff
 issue2311002_40001.diff